<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport"
        content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
<div id="app"></div>
<button id="l-btn">触发 LocalStorage 更新</button>
<button id="s-btn">触发 SessionStorage 更新</button>
<script>
  window.onstorage = function (e) {
    console.log(e)
    console.log(`The ${e.key}  key has been changed from ${e.oldValue}  to  ${e.newValue} .`);
  };

  document.getElementById('l-btn').onclick = function () {
    localStorage.setItem('storage1', Date.now())
  }

  document.getElementById('s-btn').onclick = function () {
    sessionStorage.setItem('storage1', Date.now())
  }
</script>

</body>
</html>
